The Dark Energy Spectroscopic Instrument has created the largest 3D map of the Universe, charting millions of galaxies. Early results suggest dark energy may evolve over time, challenging long-held cosmological theories.​The Dark Energy Spectroscopic Instrument has created the largest 3D map of the Universe, charting millions of galaxies. Early results suggest dark energy may evolve over time, challenging long-held cosmological theories.  ​ science